NOTICE OF VALIDATION MIL-L-7158E NOTICE 1

advertisement
NOTICE OF
VALIDATION
MIL-L-7158E
NOTICE 1
15 January 1991
MILITARY SPECIFICATION
LIGHT, BEACON, ROTATING, 24-INCH
MIL-L-7158 dated 15 Sep 69 has been reviewed and determined to be valid for
use in acquisition.
Custodians:
Air Force - 99
Navy - AS
Preparing activity:
Air Force - 82
Review activity:
DLA-GS
DISTRIBUTION STATEMENT A.
unlimited.
Approved for public release; distribution is
MIL-L-7158E(ASG)
15 SEPTEMBER 1969
Superseding
MIL-L-007158D(USAF)
14 March 1969
MILITARY SPECIFICATION
LIGHT, BEACON, ROTATING, 24-INCH
This specification has been approved by the Department
of the Air Force and by the Naval Air Systems Command.
1.
SCOPE
1.1 This specification covers 24-inch, rigid, drum-type, rotating beacon
lights for use by the Department of Defense and the Federal Aviation Agency
in locating airports and airways.
2.
APPLICABLE DOCUMENTS
2.1 The following documents, of the issue in effect on date of
invitation for bids or request for proposal, form a part of this
specification to the extent specified herein:
SPECIFICATIONS
Federal
QQ-A-601
QQ-C-390
Aluminum-Alloy Sand Castings
Copper Alloy Castings (Including Cast Bar)
Military
MIL-P-116
MIL-P-5272
MIL-B-26195
Preservation, Methods of
Environmental Testing, Aeronautical and Associated
Equipment, General Specification for
Box, Wood-Cleated, Skidded, Load-Bearing Base
STANDARDS
Military
MIL-STD-100
MIL-STD-129
MIL-STD-130
MIL-STD-143
MIL-STD-831
MIL-STD-1186
Engineering Drawing Practices
Marking for Shipment and Storage
Identification Marking for US Military Property
Specifications and Standards, Order of Precedence for
the Selection of
Test Reports, Preparation of
Cushioning, Anchoring, Bracing, Blocking, and
Waterproofing, With Appropriate Test Methods
FSC 6210
MIL-L-7158E(ASG)
MS15006
MS20003
MS25015
MS25443
MS25444
Fitting, Lubrication (Hydraulic) Leakproof, 1/8 Pipe
Threads, Steel, Type VI
Indicator, Humidity, Card, Three Spot, Impregnated
Areas (Cobaltous Chloride)
Lamp, Incandescent, T-20 Bulb, Mogul, Bipost Base
Light, Rotating Beacon, 24 Inch, Single
Light, Rotating Beacon, 24 Inch, Duplex
DRAWINGS
Air Force-Navy Aeronautical Standard Issues of Federal Aviation Agency
D-2311
D-2312
D-2321
D-2331
D-2341
Rotating Mechanism, Assembly
Duplex Drum Support
Rotary Lamp Changer, Assembly
24-Inch Rigid Drum Housing, Assembly
Tri-leg Drop Pan Base, Assembly
(Copies of specifications, standards, drawings, and publications required
by suppliers in connection with specific procurement functions should be
obtained from the procuring activity or as directed by the contracting
officer.)
3.
REQUIREMENTS
3.1 Preproduction. - This specification makes provisions for
preproduction testing.
3.2 Components. - The light assembly shall consist of the base,
rotating mechanism, and projector housing(s) with optical system.
3.3 Selection of specifications and standards. - Specifications and
standards for necessary commodities and services not specified herein shall
be selected in accordance with MIL-STD-143.
3.4 Materials. - Materials shall conform to applicable specifications
as specified herein and on the drawings or standards. Materials which are
not specifically designated shall be of the best commercial quality and
suitable for the purpose intended.
3.4.1
Metals.
3.4.1.1 Bronze castings. - Bronze castings shall be in accordance with
QQ-C-390, alloy No. B6.
3.4.1.2 Aluminum-alloy castings. - Aluminum-alloy castings shall be an
alloy conforming to QQ-A-601, class 2M or 5M.
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MIL-L-7158E(ASG)
3.4.1.3 Fasteners. - Fasteners shall be of nonferrous metal or
corrosion-resistant steel, and shall be provided with self-locking nuts,
lockwashers, or other equal means of preventing the parts from working loose
under prolonged vibration. Bolts subject to frequent removals shall be
threaded into nonferrous metal or corrosion-resistant steel inserts.
3.5 Design and construction. - The light to be supplied shall consist
of the item covered by the part number on MS25443 or MS25444, as specified
(see 6.2).
3.5.1 Alternate design. - Lights manufactured with parts of slightly
different designs than those shown on the applicable FAA drawing numbers will
be considered satisfactory, provided the difference in design does not affect
the performance or interchangeability of the assemblies.
3.5.2 Operating conditions. - The light shall be designed and
constructed for continuous outdoor use under all weather conditions at any
ambient temperature from a minimum of -54 deg. C (-65 deg. F) to a maximum
of +55 deg. C (131 deg. F).
3.6 Performance. - The light shall satisfy the performance requirements
specified in section 4, when subjected to the applicable tests.
3.6.1 Candlepower distribution. - With the cover glass (lens) removed,
the vertical light distribution through the focal axis of the beacon shall
be essentially as shown by the solid line on figure 1. Measurements shall be
taken using a MS25015-2 lamp. The hypothetical curve (solid line) defines an
area of 13.55 by 10À6Ù candle-degrees. In no instance shall the vertical
light distribution (through focal axis) enclose an area of less than 13.0 by
10À6Ù candle-degrees within the limits defined by the solid line shown on
figure 1. In no instance shall the vertical distribution curve fall inside
the area defined by the inner (dashed) line shown on figure 1. In addition,
the horizontal width of the beam shall be not less than 1 degree at the
vertical angles and intensities defined by the dashed line shown on figure 1.
The required distribution shall be obtained by properly positioning the lamp
and the auxiliary reflector with respect to the principal reflector and by
tilting the drum if necessary. No means of focusing, other than that
required to obtain the initial factory adjustment, need be provided.
3.7 Base. - The base, conforming to Drawing E-2341, shall consist of an
aluminum-alloy bedplate, a bearing support, three supporting studs or legs,
and a pan enclosing the operating mechanism.
3.8 Rotating mechanism. - The rotating mechanism, conforming to Drawing
D-2311, shall consist essentially of a turntable and vertical spindle, main
bearings, clutch, gears, and motor. The entire rotating mechanism shall be
so assembled that there will be no objectionable vibration of the lamps at
any speed up to 24 rpm.
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MIL-L-7158E(ASG)
3.8.1 Turntable. - The housing drum shall be supported on a rectangular
steel turntable, threaded, and then welded to the top of the vertical hollow
steel spindle. The free joint between the turntable and the bearing support
shall be protected by a weather skirt terminating below the joint and at
least 1 inch from any part of the base. When duplex units are furnished, a
drum support, as shown on Drawing D-2312, shall be supplied to support the
two lights.
3.8.2 Main bearings. - The main bearings shall consist of two bearings
supporting a vertical spindle within a bearing support. The upper bearing
shall be a tapered roller-bearing. It shall be backed up with an oil seal
similar and equivalent to Victor Seal No. 60771. The lower bearing shall be
a permanently lubricated ball bearing. It shall keep the spindle vertically
aligned, and shall be provided with a double seal similar and equivalent to
New Departure seal No. 88509. The upper bearing shall be provided with a
lubricator in accordance with MS15006.
3.8.3 Clutch. - A clutch assembly shall be provided to permit the gear
train to rotate without injury in case the drum is prevented from rotating by
an ice lock or other obstruction to rotation. The clutch shall consist of a
cadmium-plated spring steel plate attached to a bronze nut, threaded to a
gear sleeve, and so designed as to permit the clutch tension to be adjusted
by compressing the plate against the continuous boss on the web of the
cast-iron control section of the worm wheel. The nut shall be arranged for
locking to the gear sleeve by a setscrew engaging slots at 90 degree
intervals on the sleeve. The clutch shall be adjusted to provide a torque
of not less than 10 pound-feet nor more than 15 pound-feet initially on the
vertical spindle for single drum beacons, and not less than 15 pound-feet nor
more than 20 pound-feet for duplex beacons.
3.8.4 Gears. - Each light shall be provided with a worm and a worm
wheel reduction gear designed to provide the specified angular velocity (see
6.2). The worm gear shall be of bronze, 1-inch pitch diameter, double thread
for 12-rpm beacons, single thread for 6-rpm beacons, and shall ride a free
fit on a 1/2-inch motor shaft. The worm shall be engaged by a pin carried by
a driving collar attached to the motor shaft. The worm wheel shall have a
cast-iron center section, treated with a rust-preventive slushing compound,
and a micarta ring seating against a flange and shoulder, and held in place
by eight equally spaced No. 10 brass machine screws. The micarta ring shall
be threaded to mesh with the bronze driving worm. A bronze gear sleeve
(same sleeve to which the clutch adjusting nut is threaded) shall be threaded
to the vertical spindle and shall be provided with lugs and flanges for the
mounting of the two upper slip-rings and the contactor or blank cam. It
shall also support the worm wheel in vertical alignment with the driving
worm. Clearance between the gear sleeve and the worm wheel hub shall
provide a running fit. The gears shall be so arranged that the rotation
speed of the light may be readily changed from nominal 12 rpm to nominal 24
rpm or to nominal 6 rpm by changing the driving worm and the micarta ring on
the worm wheel. The driving worm shall be shielded to prevent the throwing
of grease.
5
MIL-L-7158E(ASG)
3.8.5 Motor. - Each beacon shall be equipped with a 1/6-hp, 115V,
60-cycle 1,140 rpm motor of the squirrel-cage type. Each motor shall be
equipped with single-row, deep-groove, sealed, prelubricated, double-shield,
annular-type bearings. The sealed, prelubricated bearings shall not require
additional lubrication for the life of the bearing. The motor shall drive
the rotating mechanism through the worm gear. It shall be ceiling-mounted on
machined bosses on the underside of the bedplate in such a manner as to
insure exact alignment and meshing between the worm gear and worm wheel
without the use of shims. All motors shall be fully interchangeable with
each other as to mounting and shaft dimensions and shall be dynamically
balanced to prevent setting up any objectionable vibrations.
3.8.5.1 Motor details. - All motors shall have separate starting and
running windings, and a centrifugal switch which disconnects the starting
winding from the line when the speed exceeds three-fourths of the rated
speed. There shall be no friction introduced by the disconnecting means at
any time other than at the instant of opening or closing the starting
circuit. The locked rotor current with both starting and running windings in
the circuit shall not exceed 19 amp at rated voltage. The locked rotor
current with only the running winding in the circuit shall not exceed 11 amp
at rated voltage. When operated continuously for not less than 12 hours at
rated voltage and frequency and with the drum held to prevent rotation and
the clutch slipping, the temperature rise shall not exceed 40 deg. C (104
deg. F). Readily accessible external binding posts shall be made for
reversing rotation by interchanging leads of the windings terminating at the
binding posts.
3.9 Projector housing. - The projector housing shall be in accordance
with Drawing E-2331 and shall consist of a drum, lamp changer, auxiliary
reflector, principal reflector, and cover glass and lens. Unless otherwise
specified (see 6.2), the cover glass or lens shall be furnished with the
beacon. The cover glass or lens to be used shall be a specified on the
applicable MS standard.
3.9.1 Drum. - The drum, in accordance with Drawing E-2331, shall be
cast in one piece of aluminum alloy. The principal reflector shall be
installed in the back of the drum, provision being made for a 0.5-inch
airspace between the drum and the reflector. The drum shall be rigidly fixed
on the turntable so that the light emitted meets the requirements specified
on figure 1 when the turntable is horizontal. Six C-clamps shall be provided
at 60 degree intervals around the face of the drum and shall afford means for
drawing the cover gasket into watertight contact with the edge of the drum.
3.9.2 Cover. - The cover, in accordance with Drawing E-2331, shall
consist of a frame attached to the drum by a hinge for mounting a cover glass
or lens. The frame shall be one-piece cast-aluminum alloy. The arrangement
to mount the covered glass shall consist of 12 clips separated from the glass
by cork in a manner that provides for expansion without breakage. Presstite
caulking compound, or equivalent, shall be used to waterproof the joint
between the glass and frame in those lights which are procured with the
lenses or cover glasses installed. A pliant rubber or rubber substitute
gasket of rectangular cross section shall be inserted and cemented in the
groove provided in the frame to render the joint between the cover and the
drum weathertight. A suitable door stop shall be provided to permit the door
to open at least 90 degrees but not more than 100 degrees.
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MIL-L-7158E(ASG)
3.9.3 Lamp changer. - The lamp changer, in accordance with Drawing
E-2321, shall provide a means of mounting a service lamp and reserve lamp.
It shall automatically interchange the lamps when the service lamp fails.
The current-carrying parts of the lamp changer, the series coil being
shorted, shall not overheat when a lamp drawing 30 amp is operated
continuously in either holder for 18 hours. The total contact voltage drop
shall not exceed 0.03V with a 30-amp current. The rotation of the lamp
changer shall be adequately damped to prevent the lamps from being unduly
jolted when interchanged. The lamp changer shall not introduce a voltage
drop or more than 0.5V or consume more than 3 watts, except during the
operation of interchanging lamps. The lamp changer platform shall be
mechanically locked both before and after interchanging lamps. When the lamp
changer operates, it shall open the circuit to the service lamp and
automatically close the circuit through the reserve lamp. The trip coil
shall be so wired into the circuit that it is automatically disconnected
after performing its function of relasing the turntable catch and shall not
be re-energized on failure of the reserve lamp. When lights being furnished
are to be arranged for use with 1,200-watt lamps, the design of the contact
blocks (parts 217 and 218), and the position of the receptacle supports
(parts 213 and 219) with respect to the rod (part 207) shall be changed to
accommodate this lamp.
3.9.4 Auxiliary reflector. - The auxiliary reflector shall be in
accordance with Drawing E-2321, and shall be made of aluminum. It shall have
a spherical reflector surface, electrically brightened, and anodized for
protection. The surface of the reflector shall be bright and free from any
haze that would cause an image to appear blurred.
3.9.5 Principal reflector. - The principal reflector shall consist of
a commercial glass parabolic reflector having an effective diameter not less
than 24 inches and a focal length of 10 +/-0.20 inches. The reflector shall
be silvered, coppered, and backed with a commercial black backing. The
reflector shall be legibly and permanently marked on the front surface of the
glass near the rim to indicate the distance in inches and hundredths of an
inch from the vertex of the reflecting surface to the focus, minus the
thickness of the glass.
3.10
Light source. -
3.10.1 Lamps. - The beacons shall be designed and socketed to use the
lamps specified on the applicable drawing or standard.
3.11 Conductors. - All electrical connections shall originate at a
suitable terminal block having eight terminals. The terminals shall be the
type shown on Drawing D-2311. The block shall be mounted on a support
attached to the bedplate. The terminals shall be marked designating each
circuit. Conductors supplying current to the lamp changer shall be No. 8 AWG
single-conductor, rubber or rubber-like synthetic insulated, braid-covered,
flexible cable and shall run from the terminal block to brush holder
supports. Copper-graphite composition brushes of 60-amp capacity shall
supply current to two bronze collector rings mounted on a molded asbestos
plate attached to a flange on the gear sleeve. The brushes shall be held in
holders mounted on the contactor panel. These holders shall have adjustable
springs to hold the brushes in proper contact pressure against the collector
rings. Conductors from the terminal block to the motor shall be No. 12
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MIL-L-7158E(ASG)
or 14 AWG single-conductor, rubber or rubber-like synthetic insulated,
braid-covered, flexible cable. A fuse block and 10-amp plug-type fuse shall
be provided in the power circuit to protect the motor. All wires, brushes,
and brush holders shall conform to the requirements of the Underwriters'
Laboratories.
3.12 Part numbering of interchangeable parts. - All parts having the
same manufacturer's part number shall be functionally and dimensionally
interchangeable. The item identification and part number requirements of
MIL-STD-100 shall govern the manufacturer's part numbers and changes thereto.
3.13
Markings. -
3.13.1 Instruction plate. - An instruction plate shall be securely
attached to the outside of the pan which encloses the operating mechanism.
The instruction plate shall include a wiring diagram, clearly showing the
power connection terminals together with the voltage to be applied,
description of the lamps required in the light, and information regarding
lubrication of the light.
3.14 Instruction data. - An instruction manual shall be provided as
follows, and when specified (see 6.2), drawings, parts lists, or other data
shall be provided.
3.14.1 General instruction. - Unless otherwise specified, one
instruction manual shall be enclosed in a suitable waterproof envelop or case
and shipped with each light. One manual shall be furnished to the procuring
activity. Instruction manuals shall cover the installation, operation, and
maintenance of the light. Manuals shall be prepared on 8- by 10-1/2-inch
white paper with black lettering and lines.
3.14.1.1 Installation section. - All information necessary for the
installation of the lights shall be incorporated in the instructions. A
mounting diagram shall be included. All holes to be drilled shall be
specified by drill size and diameter in inches. A view showing interference
dimensions shall be included.
3.14.1.2 Operation section. - The operation section shall include a
cutaway illustration of the light with the important parts labeled, and a
three-quarter side view of the light. The illustration shall be clear and
easily readable. The operation of the light shall be explained in detail,
using the cutaway view for illustration. Drawings, wiring diagrams, and
additional illustrations shall be supplied where their use would simplify the
explanation. All instructions for the proper use of the light shall be
included.
3.14.1.3
Maintenance section. - The maintenance section shall include:
(a)
(b)
Procedure used in disassembly of the light
Necessary information on the care and upkeep of the light.
Important cautions, where necessary, should be printed in
distinctive letters.
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MIL-L-718E(ASG)
3.15 Identification of product. - Equipment, assemblies, and parts
shall be marked for identification in accordance with MIL-STD-130.
3.16 Workmanship. - Workmanship shall be in accordance with high-grade
commercial practice covering this class of work.
4.
QUALITY ASSURANCE PROVISIONS
4.1 Responsibility for inspection. - Unless otherwise specified in the
contract or purchase order, the supplier is responsible for the performance
of all inspection requirements as specified herein. Except as otherwise
specified in the contract or order, the supplier may use his own or any other
facilities suitable for the performance of the inspection requirements
specified herein, unless disapproved by the Government. The Government
reserves the right to perform any of the inspections set forth in the
specification where such inspections are deemed necessary to assure supplies
and services conform to prescribed requirements.
4.2 Classification of inspections. - The inspections of the light shall
be classified as follows:
(a)
(b)
Preproduction inspection (4.3)
Quality conformance inspection (4.4)
4.3 Preproduction inspection (see 6.2). - The preproduction
inspection shall consist of the examination and tests specified in 4.5.
4.3.1 Test sample. - One light shall be subjected to the examination
and tests specified in 4.5.
4.3.2 Test report. - After completion of the preproduction inspection,
a test report shall be prepared in accordance with MIL-STD-831 and three
complete copies of the report furnished to the procuring activity.
4.4 Quality conformance inspection. - The quality conformance
inspection shall consist of the following:
(a)
(b)
Individual tests (4.4.1)
Sampling plan and test (4.4.2)
4.4.1 Individual tests. - Each light shall be subjected to the
following examination and tests, as described under 4.5:
(a)
(b)
(c)
(d)
(e)
Examination of product (4.5.1)
Angular velocity (4.5.2)
Friction (4.5.3)
Candlepower distribution (4.5.4)
Auxiliary reflector (4.5.5)
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MIL-L-7158E(ASG)
4.4.2
Sampling plan and tests. -
4.4.2.1 Periodic sampling. - One light shall be selected at random from
every fifty or fraction thereof produced, and subjected to the following
tests, as described under 4.5:
(a)
(b)
(c)
Locked drum (4.5.6)
Strength (4.5.7)
Lamp changer (4.5.8)
4.4.2.1.1 Rejection and retest. - When an item selected from a
production run fails to meet the specification, no items still on hand or
produced later shall be accepted until the extent and cause of failure have
been determined and appropriately corrected. The contractor shall explain to
the Government representative the cause of failure and the action taken to
preclude recurrence. After correction, all of the tests shall be repeated.
4.4.2.1.2 Individual tests may continue. - For production reasons,
individual tests or other sampling plans may be continued pending the
investigation of a sampling test failure. But final acceptance of the items
on hand or items produced later shall not be made until it is determined that
all items meet all the requirements of the specification.
4.4.3 Defects in items already accepted. - The investigation of a test
failure could indicate that defects may exist in items already accepted. If
so, the contractor shall fully advise the procuring activity of all the
defects likely to be found and the method of correcting them.
4.5
Inspection methods. -
4.5.1 Examination of product. - Each light shall be examined to
determine conformance to this specification with respect to all requirements
not covered by tests.
4.5.2 Angular velocity. - The mean elapsed time, in minutes per
rotation, of three cycles of not less than five successive rotations each,
shall be determined for each unit. The reciprocal of the time so determined
shall be taken as the angular velocity of the unit. The deviation of any one
of the three cycles shall not differ by more than 1 percent from the mean of
the three cycles.
4.5.2.1 Motors. - The angular velocity of the housing with the motor
operated at rated voltage and frequency shall not be less than 5.95 rpm nor
more than 6.35 rpm for nominal 6-rpm units.
4.5.3 Friction. - The light shall be rotated for 2 hours in insure that
it is correctly assembled and adjusted. After this period of operation, the
power consumption required for rotation shall not exceed 10 watts. The
consumed power shall be the difference between the no-load power input to the
motor and the power input to the motor when it is driving a unit at normal
rotation. The no-load input shall be taken as the average of the no-load
inputs of five selected motors, except
10
MIL-L-7158E(ASG)
when the computed consumed power is in excess of 10 watts, the no-load input
of the motor undergoing tests shall be determined and used for the
computation. There shall be no evident vibration of the lamp filaments with
the lamps in place on the lamp changer.
4.5.4
Candlepower distribution. -
4.5.4.1 Photometric tests. - Each light shall be aligned, leveled, and
tested to determine compliance with the requirements of 3.6.1 and figure 1.
Any light failing to meet these requirements shall not be accepted until it
is adjusted so that it will meet these requirements.
4.5.4.2 Focusing gages. - When specified (see 6.2), the candlepower
measurements need be taken on only one light in each lot of 50, or less, of
each contract or order. The lamp position of all other lights shall be
checked by means of an adjustable gage capable of properly locating the
filament of a dummy lamp with respect to the optical axis and the focal point
of the reflector. The dummy lamp used with this gage shall simulate the CC-8
filament of the MS25015-2 lamp.
4.5.5 Auxiliary reflector. - Each auxiliary reflector shall be visually
inspected. Any reflector that has a cloudy or hazy surface causing an image
to be blurred shall be rejected.
4.5.6 Locked drum. - With rated voltage applied to the motor, the drum
of the light shall be locked and the clutch shall be allowed to slip
continuously for 18 hours. At the end of this period, the motor shall not be
overheated and there shall be no evidence of excessive wear to any part of
the mechanism.
4.5.7 Strength. - The light shall be bolted in place as when
in service. A lateral thrust of 500 pounds shall be applied
horizontally on any line through the center of the housing through a
calibrated spring balance. There shall be no damage to any part of the
light.
4.5.8 Lamp changer. - The lamp shall be subjected to a current flow of
11.4 amp from terminal to terminal for a period of 2 hours. With the series
coil shunted, it shall be subjected to a current of 30 amp for 18 hours.
(This test may be abbreviated to 5 minutes with the approval of the procuring
activity.) Immediately following this test, the lamp changer shall be
subjected to a simulated service test in which the current through the
service lampholder shall be periodically interrupted and the lamp changer
allowed to interchange lamps. The lamp changer shall then be restored to the
service position. The lamp changer shall operate for 200 such cycles without
any failure. The lamp changer used in the test may be reconditioned to
replace any worn or damaged parts and used in one of the lights on the order.
4.5.9 Low temperature. - The light shall be subjected to the low
temperature test, procedure I, of MIL-E-5272. The light shall be examined
and operated to determine proper starting and operation, and lack of damage.
4.6 Inspection of preparation for delivery. - Preservation, packaging,
packing, and marking shall be inspected to determine conformance to section 5.
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MIL-L-7158E(ASG)
5.
PREPARATION FOR DELIVERY
5.1 Preservation and packaging. - Preservation and packaging shall be
Level A or C, as specified (see 6.2).
5.1.1 Level A. - Unless otherwise specified (see 6.2), each light shall
be preserved and packaged in accordance with Method IIa of MIL-P-116. Each
light shall be securely mounted on a suitable platform or base by means of
cap screws threaded into the supporting legs. When the light is packaged
with the lens installed, the lens shall be cushioned as necessary to protect
it from damage. When a lens is not required, a 1/4 inch plywood disk shall
be fitted in the door and sealed in a manner to effect a waterproof cover
when the door is closed. A humidity indicator conforming to MS20003 shall be
secured in place so that it will face out, free from the position coincident
with the inspection means provided.
5.1.1.1 Unit container. - Each light shall be packaged in one unit
container. Blocking, bracing, and cushioning shall be in accordance with
MIL-STD-1186. The unit container shall be the shipping container and shall
conform to the requirements of 5.2 and be of uniform shape and size.
5.1.1.2 Level C. - Each light shall be preserved and packaged in a
manner which will afford adequate protection against corrosion during
shipment from the supply source to the first receiving activity for immediate
use. This level may conform to the supplier's commercial practice when such
meets the requirements of this level.
5.2
6.2).
Packing. - Packing shall be level A, B, or C, as specified (see
5.2.1 Level A. - Each light, preserved, and packaged as specified in
5.1.1, shall be packed in a container conforming to type II, style A, class 1
(full plywood base) of MIL-B-26195. The side, top, and end panels shall be
fabricated of plywood. Load bearing floor members shall be spaced as
necessary to adequately support the packaged item.
5.2.2 Level B. - Same as level A, except the container shall be type I
of MIL-B-26195.
5.2.3 Level C. - Each light, preserved and packaged as specified in
5.1.1.2, shall be packed in a manner which will afford adequate protection
against damage during shipment from the supply source to the first receiving
activity for immediate use. This level shall conform to applicable carrier
rules and regulations and may be the supplier's commercial practice, when
such meets the requirements of this level.
5.3 Marking. - In addition to any special marking required by the
contract or order (see 6.2), the interior packages and exterior shipping
containers shall be marked in accordance with MIL-STD-129.
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MIL-L-7158E(ASG)
6.
NOTES
6.1 Intended use. - The lights covered by this specification are
intended for use in locating airports and airways.
6.2 Ordering data. - Procurement documents should specify the
following:
(a)
(b)
(c)
(d)
(e)
(f)
(g)
(h)
(i)
Title, number, and date of this specification.
Applicable part number of the beacon desired (see 3.5 and
3.10.1).
When the cover glass and lens are to be furnished with the
beacon (see 3.9).
Requirement for rpm (see 3.8.4).
When drawings, parts lists, etc., are to be provided (see
3.14.1).
Location and conditions for preproduction inspection and
instructions for submitting test report (see 4.3).
Whether the candlepower requirements are required on each light
and whether the lamp position may be checked by means of a lamp
focusing gage (see 4.5.4.2).
Applicable level of preservation, packaging, and packing (see
section 5).
Any special marking required (see 5.3).
6.3 Marginal indicia. - Asterisks are not used in this revision to
identify changes with respect to the previous issue, due to the extensiveness
of the changes.
Custodians:
Air Force - 11
Navy - AS
Preparing activity:
Air Force - 11
Reviewer activity:
Air Force - 82
Project No. 6210-F338
13
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